​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>Example list:</p>
​
<ul>
  <li id="myLI">Coffee</li>
  <li>Tea</li>
</ul>
​
<p>单击该按钮可获取列表中 li 元素的父元素的节点名称。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myLI").parentElement.nodeName;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​